shared: Use uint8_t in hash_superfast

Characters in key are supposed to be handled unsigned. Explicitly cast
key[2] in case the key contains 8-bit ASCII. Even though we cannot
support such keys in indices, we might still use them in module names
and tools like modinfo.

Signed-off-by: Tobias Stoeckmann <[email protected]>

Author: stoeckmann

shared/hash.c

@@ -94,7 +94,7 @@ static inline unsigned int hash_superfast(const char *key, unsigned int len)
 	case 3:
 		hash += get_unaligned((uint16_t *)key);
 		hash ^= hash << 16;
-		hash ^= key[2] << 18;
+		hash ^= ((uint8_t)key[2]) << 18;
 		hash += hash >> 11;
 		break;